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deep sleep: add option to delay CPU startup

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When ESP32 wakes up from deep sleep, flash is accessed an approximately 900us after power on.
Some flash chips need more time to become ready. This change adds a menuconfig option to add
some delay to the default deep sleep wake stub.

Fixes https://github.com/espressif/esp-idf/issues/117
This commit is contained in:
Ivan Grokhotkov 2016-12-12 23:20:15 +08:00
parent 3b854fe46a
commit eac80b0651
2 changed files with 26 additions and 0 deletions
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19
components/esp32/Kconfig
View file

@ -452,6 +452,25 @@ config ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL
endchoice
config ESP32_DEEP_SLEEP_WAKEUP_DELAY
int "Extra delay in deep sleep wake stub (in us)"
default 0
range 0 5000
help
When ESP32 exits deep sleep, the CPU and the flash chip are powered on
at the same time. CPU will run deep sleep stub first, and then
proceed to load code from flash. Some flash chips need sufficient
time to pass between power on and first read operation. By default,
without any extra delay, this time is approximately 900us.
If you are using a flash chip which needs more than 900us to become
ready after power on, set this parameter to add extra delay
to the default deep sleep stub.
If you are seeing "flash read err, 1000" message printed to the
console after deep sleep reset, try increasing this value.
config ESP32_PHY_AUTO_INIT
bool "Initialize PHY in startup code"
default y

7
components/esp32/deepsleep.c
View file

@ -26,6 +26,7 @@
#include "driver/rtc_io.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "sdkconfig.h"
/* Updating RTC_MEMORY_CRC_REG register via set_rtc_memory_crc()
is not thread-safe. */
@ -66,6 +67,12 @@ void RTC_IRAM_ATTR esp_default_wake_deep_sleep(void) {
/* Clear MMU for CPU 0 */
REG_SET_BIT(DPORT_PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MMU_IA_CLR);
REG_CLR_BIT(DPORT_PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MMU_IA_CLR);
#if CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY > 0
// ROM code has not started yet, so we need to set delay factor
// used by ets_delay_us first.
ets_update_cpu_frequency(ets_get_detected_xtal_freq() / 1000000);
ets_delay_us(CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY);
#endif
}
void __attribute__((weak, alias("esp_default_wake_deep_sleep"))) esp_wake_deep_sleep(void);